Speed drill



7 April 20, 1943.

V A. A. NUMMELIN 2,317,106

SPEED DRILL Filed 001;. '1, 1941 2 Sheets-Sheet 1 Inventor April 20, 1943. A. A. NuMME-LIN SPEED DRILL Filed Oct. 1, 1941 2 Sheets-Sheet 2 Patented Apr. 29, 1943 2,317,1iiii Arthur A. Nummelin, Ingleweod, Calif.

Application October 1, 1941, Serial No. 413,230

2 Claims.

The present invention relates to new and useful improvements in hand-operated drills and has for its primary object to provide a magazine feed for the drill bit to selectively feed a bit of desired size into position in the chuck of the drill.

A further object is to provide a device of this character of simple and practical construction, which is efficient and reliable in performance, relatively inexpensive to manufacture, and otherwise well adapted for the purposes for which the same is intended.

Gther objects and advantages reside in the details of construction and operation as more fully hereinafter described and claimed, reference being had to the accompanying drawings forming part hereof, wherein like numerals refer to like parts throughout and in which:

Figure 1 is a side elevational View of the drill.

Figure 2 is a similar View of an opposite side of the drill.

Figure 3 is a vertical sectional view taken substantially on a line 33 of Figure 1.

Figure 4 is a transverse sectional view taken substantially on a line i i of Figure 3, and

Figure 5 is a fragmentary vertical sectional view taken substantially on a line 55 of Figure 3.

Referring now to the drawings in detail wherein for the purpose of illustration I have disclosed a preferred embodiment of the invention, the numeral 5 designates the tubular shank of the drill having a sleeve 6 rotatably mounted on the lower end of the shank, the lower end of the sleeve being externally threaded for threadedly attaching the shell I of a chuck member thereto. The chuck member 1 is provided with the usual tapering lower end 8 within which is positioned the jaw segments 9 adapted for clamping engagement with the shank portion of the bit H] which projects through the lower end of the chuck.

Secured to the lower end of the shank 5 is an annular flange I I having a central opening communicating with the bore of the shank and by means of which the drill bit may pass downward- 1y through the shank into the chuck, the drill bit having a head l2 formed thereon, for resting on the flange II to support the bit with the cutting end thereof projecting outwardly of the chuck.

Secured to the upper end of the sleeve 6 is a gear I3 engaged by a ring gear I4 having a crank handle l5 attached thereto, the gear being journaled on a screw it projecting laterally outwardly from the shank 5. An idler gear IT is also mounted on the shank 5 to prevent wobbling of the ring gear [4 during the operation thereof.

Mounted on the upper end of the shank 5 is a magazine designated generally at It and which constitutes a handle for the drill. The magazine is of cylindrical form and includes a stationary bottom it) having an eccentric passage 213 threaded on the shank, a centrally disposed stem 2% rising from the bottom of the magazine and on which is rotatably mounted a barrel 22 having a plurality of longitudinal chambers 23 extending entirely therethrough and adapted to selectively register at their lower ends with the passage 20. Bits of various sizes are placed in the chambers and drop into the shank 5 when the chambers are moved into registering position with the passage 28.

A cap 25 is secured to the upper end of the stem 2| by a screw 25 for closing the upper ends of the chambers.

The cap is provided with a sliding catch 26 having a spring 2'! projecting one end of the catch downwardly for entering one or the chambers 23 to secure the barrel against rotation. A handle 23 projects laterally from the catch through a slot 29 to release the catch and permit rotation of the barrel to bring a desired bit into position for dropping into the chuck.

The sides of the barrel may be provided with indicia 352 to designate the size of the bits in the respective chambers.

It is believed the details of construction and manner of use of the device will be readily understood from the foregoing without further detailed explanation.

Having thus described the invention what is claimed as new is:

1. A magazine feed for the tubular shank of a drill bit comprising a stationary part having a passage communicating with the shank, a stem rising from said stationary part, a rotary part mounted on the stem and having a plurality of chambers disposed concentrically around the stem and adapted to contain bits for entering the passage when the chambers are aligned therewith, a cap secured to the stationary part, and a stop carried by the cap and releasably engaging the rotary part to-secure the latter against movement.

2. A drill comprising a tubular shank, a magazine at one end of the shank for selectively feeding drill bits thereto, a sleeve journaled on the other end of the shank, a chuck secured to the sleeve adapted for receiving the bits from the shank, a pinion gear secured to the sleeve, a drive gear journaled on the shank on an axis laterally to the axis of the shank and operatively engaging the pinion gear, and an idler gear journaled on the shank and engaging the drive gear, at a side thereof diametrically opposite from the pinion gear, said pinion gear and said idler gear providing supports for diametrically opposite edges of the drive gear.

ARTHUR A. NUMMELIN. 

